remove extraneous feature used to fix ci

Cargo.toml

@@ -70,7 +70,6 @@ version = "1.0"
 default = ["std"]
 i128 = ["num-integer/i128", "num-traits/i128"]
 std = ["num-integer/std", "num-traits/std"]
-quickcheck_testing = ["quickcheck", "quickcheck_macros"]
 
 [build-dependencies]
 autocfg = "0.1.2"

ci/test_full.sh

@@ -12,7 +12,7 @@ if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.31.0|1.26.0)$ ]]; then
   FEATURES="$FEATURES i128"
 fi
 if [[ "$TRAVIS_RUST_VERSION" =~ ^(nightly|beta|stable|1.31.0)$ ]]; then
-  FEATURES="$FEATURES quickcheck quickcheck_testing"
+  FEATURES="$FEATURES quickcheck"
 fi
 
 # num-bigint should build and test everywhere.